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AS3955 датащи(PDF) 62 Page - ams AG

номер детали AS3955
подробное описание детали  NFC Forum Compliant Dynamic Tag
PDF  111 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS3955 датащи(HTML) 62 Page - ams AG

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ams Datasheet
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[v1-01] 2015-Apr-29
AS3955 − Detailed Description
Reading Received Data from Buffer
Reading received data from the buffer is similar to reading data
from an addressable registers. Difference is that, in case of
reading more bytes, they all come from the buffer. The
command mode code 101b indicates buffer operations. In case
the command is terminated by putting /SS high before a packet
of 8 bits composing one byte is read that particular byte is
considered read.
Direct Command Mode
Direct Command Mode is comprised of one command byte
followed by argument byte. SPI operation mode bits 11b
indicate Direct Command Mode. The following six bits define
command code, sent MSB first. Last two bits in argument byte
indicate success of the direct command. Value 01h of the
argument byte indicates that command was accepted, while
value 02h indicates rejected due to internal access priorities.
The argument byte does not provide information on timing of
the command execution.
Figure 65:
Sending a Direct Command over SPI
1
1
C5
C4
C3
C2
C1
C0
X
X
SCLK rising
edge Data is
transferred
from µC
SCLK falling
edge Data is
sampled
Two leading
ONE indicate
COMMAND
Mode
D7
D6
D5
D4
D3
D2
D1
D0
/SS
SCLK
MOSI



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